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/* |
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* fs/tomoyo_capability.c |
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* |
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* Implementation of the Domain-Based Mandatory Access Control. |
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* |
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* Copyright (C) 2005-2008 NTT DATA CORPORATION |
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* |
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* Version: 1.6.0-pre 2008/02/18 |
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* |
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* This file is applicable to both 2.4.30 and 2.6.11 and later. |
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* See README.ccs for ChangeLog. |
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* |
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*/ |
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/***** TOMOYO Linux start. *****/ |
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|
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#include <linux/ccs_common.h> |
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#include <linux/tomoyo.h> |
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#include <linux/realpath.h> |
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|
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/************************* VARIABLES *************************/ |
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|
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extern struct mutex domain_acl_lock; |
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extern bool sbin_init_started; |
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|
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static struct { |
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const char *keyword; |
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u8 current_value; |
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const char *capability_name; |
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} capability_control_array[TOMOYO_MAX_CAPABILITY_INDEX] = { /* domain_policy.conf */ |
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[TOMOYO_INET_STREAM_SOCKET_CREATE] = { "inet_tcp_create", 0, "socket(PF_INET, SOCK_STREAM)" }, |
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[TOMOYO_INET_STREAM_SOCKET_LISTEN] = { "inet_tcp_listen", 0, "listen(PF_INET, SOCK_STREAM)" }, |
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[TOMOYO_INET_STREAM_SOCKET_CONNECT] = { "inet_tcp_connect", 0, "connect(PF_INET, SOCK_STREAM)" }, |
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[TOMOYO_USE_INET_DGRAM_SOCKET] = { "use_inet_udp", 0, "socket(PF_INET, SOCK_DGRAM)" }, |
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[TOMOYO_USE_INET_RAW_SOCKET] = { "use_inet_ip", 0, "socket(PF_INET, SOCK_RAW)" }, |
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[TOMOYO_USE_ROUTE_SOCKET] = { "use_route", 0, "socket(PF_ROUTE)" }, |
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[TOMOYO_USE_PACKET_SOCKET] = { "use_packet", 0, "socket(PF_PACKET)" }, |
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[TOMOYO_SYS_MOUNT] = { "SYS_MOUNT", 0, "sys_mount()" }, |
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[TOMOYO_SYS_UMOUNT] = { "SYS_UMOUNT", 0, "sys_umount()" }, |
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[TOMOYO_SYS_REBOOT] = { "SYS_REBOOT", 0, "sys_reboot()" }, |
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[TOMOYO_SYS_CHROOT] = { "SYS_CHROOT", 0, "sys_chroot()" }, |
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[TOMOYO_SYS_KILL] = { "SYS_KILL", 0, "sys_kill()" }, |
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[TOMOYO_SYS_VHANGUP] = { "SYS_VHANGUP", 0, "sys_vhangup()" }, |
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[TOMOYO_SYS_SETTIME] = { "SYS_TIME", 0, "sys_settimeofday()" }, |
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[TOMOYO_SYS_NICE] = { "SYS_NICE", 0, "sys_nice()" }, |
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[TOMOYO_SYS_SETHOSTNAME] = { "SYS_SETHOSTNAME", 0, "sys_sethostname()" }, |
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[TOMOYO_USE_KERNEL_MODULE] = { "use_kernel_module", 0, "kernel_module" }, |
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[TOMOYO_CREATE_FIFO] = { "create_fifo", 0, "mknod(FIFO)" }, |
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[TOMOYO_CREATE_BLOCK_DEV] = { "create_block_dev", 0, "mknod(BDEV)" }, |
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[TOMOYO_CREATE_CHAR_DEV] = { "create_char_dev", 0, "mknod(CDEV)" }, |
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[TOMOYO_CREATE_UNIX_SOCKET] = { "create_unix_socket", 0, "mknod(SOCKET)" }, |
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[TOMOYO_SYS_LINK] = { "SYS_LINK", 0, "sys_link()" }, |
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[TOMOYO_SYS_SYMLINK] = { "SYS_SYMLINK", 0, "sys_symlink()" }, |
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[TOMOYO_SYS_RENAME] = { "SYS_RENAME", 0, "sys_rename()" }, |
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[TOMOYO_SYS_UNLINK] = { "SYS_UNLINK", 0, "sys_unlink()" }, |
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[TOMOYO_SYS_CHMOD] = { "SYS_CHMOD", 0, "sys_chmod()" }, |
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[TOMOYO_SYS_CHOWN] = { "SYS_CHOWN", 0, "sys_chown()" }, |
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[TOMOYO_SYS_IOCTL] = { "SYS_IOCTL", 0, "sys_ioctl()" }, |
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[TOMOYO_SYS_KEXEC_LOAD] = { "SYS_KEXEC_LOAD", 0, "sys_kexec_load()" }, |
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[TOMOYO_SYS_PIVOT_ROOT] = { "SYS_PIVOT_ROOT", 0, "sys_pivot_root()" }, |
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[TOMOYO_SYS_PTRACE] = { "SYS_PTRACE", 0, "sys_ptrace()" }, |
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}; |
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|
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struct profile { |
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unsigned char value[TOMOYO_MAX_CAPABILITY_INDEX]; |
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}; |
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|
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static struct profile *profile_ptr[MAX_PROFILES]; |
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|
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/************************* UTILITY FUNCTIONS *************************/ |
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|
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const char *cap_operation2keyword(const u8 operation) |
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{ |
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return operation < TOMOYO_MAX_CAPABILITY_INDEX ? capability_control_array[operation].keyword : NULL; |
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} |
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|
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static const char *cap_operation2name(const u8 operation) |
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{ |
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return operation < TOMOYO_MAX_CAPABILITY_INDEX ? capability_control_array[operation].capability_name : NULL; |
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} |
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|
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/* Check whether the given capability control is enabled. */ |
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static u8 CheckCapabilityFlags(const u8 index) |
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{ |
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const u8 profile = current->domain_info->profile; |
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return sbin_init_started && index < TOMOYO_MAX_CAPABILITY_INDEX |
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#if MAX_PROFILES != 256 |
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&& profile < MAX_PROFILES |
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#endif |
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&& profile_ptr[profile] ? profile_ptr[profile]->value[index] : 0; |
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} |
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|
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static struct profile *FindOrAssignNewProfile(const u8 profile) |
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{ |
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static DEFINE_MUTEX(profile_lock); |
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struct profile *ptr = NULL; |
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mutex_lock(&profile_lock); |
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if ( |
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#if MAX_PROFILES != 256 |
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profile < MAX_PROFILES && |
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#endif |
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(ptr = profile_ptr[profile]) == NULL) { |
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if ((ptr = alloc_element(sizeof(*ptr))) != NULL) { |
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u8 i; |
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for (i = 0; i < TOMOYO_MAX_CAPABILITY_INDEX; i++) ptr->value[i] = capability_control_array[i].current_value; |
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mb(); /* Avoid out-of-order execution. */ |
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profile_ptr[profile] = ptr; |
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} |
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} |
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mutex_unlock(&profile_lock); |
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return ptr; |
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} |
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|
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int SetCapabilityStatus(const char *data, u8 value, const u8 profile) |
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{ |
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u8 i; |
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struct profile *ptr = FindOrAssignNewProfile(profile); |
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if (!ptr) return -EINVAL; |
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for (i = 0; i < TOMOYO_MAX_CAPABILITY_INDEX; i++) { |
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if (strcmp(data, capability_control_array[i].keyword)) continue; |
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if (value > 3) value = 3; |
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ptr->value[i] = value; |
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return 0; |
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} |
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return -EINVAL; |
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} |
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|
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int ReadCapabilityStatus(struct io_buffer *head) |
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{ |
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int step; |
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for (step = head->read_step; step < MAX_PROFILES * TOMOYO_MAX_CAPABILITY_INDEX; step++) { |
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const int i = step / TOMOYO_MAX_CAPABILITY_INDEX, j = step % TOMOYO_MAX_CAPABILITY_INDEX; |
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const struct profile *profile = profile_ptr[i]; |
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head->read_step = step; |
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if (!profile) continue; |
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if (io_printf(head, "%u-" KEYWORD_MAC_FOR_CAPABILITY "%s=%u\n", i, capability_control_array[j].keyword, profile->value[j])) break; |
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} |
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return step < MAX_PROFILES * TOMOYO_MAX_CAPABILITY_INDEX ? -ENOMEM : 0; |
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} |
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|
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/************************* AUDIT FUNCTIONS *************************/ |
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|
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static int AuditCapabilityLog(const u8 operation, const bool is_granted, const u8 profile, const u8 mode) |
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{ |
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char *buf; |
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int len = 64; |
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if (CanSaveAuditLog(is_granted) < 0) return -ENOMEM; |
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if ((buf = InitAuditLog(&len, profile, mode, NULL)) == NULL) return -ENOMEM; |
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snprintf(buf + strlen(buf), len - strlen(buf) - 1, KEYWORD_ALLOW_CAPABILITY "%s\n", cap_operation2keyword(operation)); |
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return WriteAuditLog(buf, is_granted); |
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} |
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|
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/************************* CAPABILITY ACL HANDLER *************************/ |
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|
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static int AddCapabilityACL(const u8 operation, struct domain_info *domain, const struct condition_list *condition, const bool is_delete) |
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{ |
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struct acl_info *ptr; |
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struct capability_acl_record *acl; |
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int error = -ENOMEM; |
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if (!domain) return -EINVAL; |
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mutex_lock(&domain_acl_lock); |
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if (!is_delete) { |
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list1_for_each_entry(ptr, &domain->acl_info_list, list) { |
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if ((ptr->type & ~(ACL_DELETED | ACL_WITH_CONDITION)) != TYPE_CAPABILITY_ACL) continue; |
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if (GetConditionPart(ptr) != condition) continue; |
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acl = container_of(ptr, struct capability_acl_record, head); |
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if (acl->operation != operation) continue; |
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error = AddDomainACL(NULL, ptr); |
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goto out; |
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} |
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/* Not found. Append it to the tail. */ |
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if ((acl = alloc_acl_element(TYPE_CAPABILITY_ACL, condition)) == NULL) goto out; |
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acl->operation = operation; |
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error = AddDomainACL(domain, &acl->head); |
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} else { |
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error = -ENOENT; |
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list1_for_each_entry(ptr, &domain->acl_info_list, list) { |
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if ((ptr->type & ~ACL_WITH_CONDITION) != TYPE_CAPABILITY_ACL) continue; |
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if (GetConditionPart(ptr) != condition) continue; |
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acl = container_of(ptr, struct capability_acl_record, head); |
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if (acl->operation != operation) continue; |
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error = DelDomainACL(ptr); |
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break; |
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} |
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} |
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out: ; |
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mutex_unlock(&domain_acl_lock); |
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return error; |
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} |
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|
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int CheckCapabilityACL(const u8 operation) |
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{ |
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struct domain_info * const domain = current->domain_info; |
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struct acl_info *ptr; |
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const u8 profile = current->domain_info->profile; |
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const u8 mode = CheckCapabilityFlags(operation); |
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const bool is_enforce = (mode == 3); |
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bool found = 0; |
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if (!mode) return 0; |
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list1_for_each_entry(ptr, &domain->acl_info_list, list) { |
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struct capability_acl_record *acl; |
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if ((ptr->type & ~ACL_WITH_CONDITION) != TYPE_CAPABILITY_ACL) continue; |
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acl = container_of(ptr, struct capability_acl_record, head); |
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if (acl->operation != operation || !CheckCondition(ptr, NULL)) continue; |
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UpdateCondition(ptr); |
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found = 1; |
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break; |
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} |
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AuditCapabilityLog(operation, found, profile, mode); |
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if (found) return 0; |
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if (TomoyoVerboseMode()) { |
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printk("TOMOYO-%s: %s denied for %s\n", GetMSG(is_enforce), cap_operation2name(operation), GetLastName(domain)); |
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} |
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if (is_enforce) return CheckSupervisor("%s\n" KEYWORD_ALLOW_CAPABILITY "%s\n", domain->domainname->name, cap_operation2keyword(operation)); |
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else if (mode == 1 && CheckDomainQuota(domain)) AddCapabilityACL(operation, domain, NULL, 0); |
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return 0; |
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} |
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EXPORT_SYMBOL(CheckCapabilityACL); |
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|
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int AddCapabilityPolicy(char *data, struct domain_info *domain, const struct condition_list *condition, const bool is_delete) |
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{ |
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u8 capability; |
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for (capability = 0; capability < TOMOYO_MAX_CAPABILITY_INDEX; capability++) { |
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if (strcmp(data, capability_control_array[capability].keyword) == 0) { |
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return AddCapabilityACL(capability, domain, condition, is_delete); |
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} |
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} |
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return -EINVAL; |
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} |
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|
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/***** TOMOYO Linux end. *****/ |
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